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Thank you automated tests (and bobbens!), fixed alpha blending for ac…
…curacy
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slouken committed Nov 16, 2009
1 parent 88c6487 commit a038afba319658dafcf7d32e20b4aad4589af5c9
Showing with 3 additions and 3 deletions.
  1. +3 −3 src/video/SDL_blit.h
@@ -444,9 +444,9 @@ do { \
/* Blend the RGB values of two Pixels based on a source alpha value */
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \
do { \
dR = (((sR-dR)*(A)+255)>>8)+dR; \
dG = (((sG-dG)*(A)+255)>>8)+dG; \
dB = (((sB-dB)*(A)+255)>>8)+dB; \
dR = ((((int)(sR-dR)*(int)A)/255)+dR); \
dG = ((((int)(sG-dG)*(int)A)/255)+dG); \
dB = ((((int)(sB-dB)*(int)A)/255)+dB); \
} while(0)


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